Things you'll need:-
- An Open ID
- An RSS feed for just your Facebook status updates. Go to your profile, click on minifeed, see All. Click on Status Stories. There's a Subscription link bottom right.
- An RSS feed for your friends' Facebook status updates. Friends - Status updates from the drop down at the top of the page. There's a Subscription link bottom right.
- A dummy Twitter account. Create a new Twitter account and follow it from your main account.

1. Route your Facebook updates so when you post it also posts to Twitter.
- Login with your OpenID into Twitterfeed.
- Create a new entry. Put in your main Twitter account ID and Password and the RSS for your status updates.
- Update 30 minutes, Include title only, Include Item link, Prefix each Tweet with FB.

Now each time you post a status update on Facebook, within 30 minutes it will create a Tweet from you on Twitter with a link back to your profile on Facebook.

2. Route your Friends' Facebook updates so when they set their status on Facebook, you can read it in Twitter.
- Login with your OpenID into Twitterfeed.
- Create a new entry. Put in your dummy Twitter account ID and Password and the RSS for your friends' status updates.
- Update 30 minutes, Include title only, Include Item link, Prefix each Tweet with FB.

Now each time any of your friend's post a status update on Facebook, within 30 minutes it will appear in your Twitter Friend's timeline with a link back to their profile on Facebook.

You can use the same basic technique for any service that has one or both RSS feeds. It works better with services that include the name of the poster in the title. So Facebook, Plazes, Jaiku but not Pownce.

AFAIK, Twitter is the only service with an API for updating a status externally and a 3rd party RSS to post service. Which means Twitter ends up as the best aggregator for all your services. So the next question is which service you should use as your main update. I'm finding myself doing most of my updates on Twitter with occasional updates on Facebook and Ecademy to keep my profile on those services fresh.